I don't know if it's legit or not (and I also have not followed prices for anglers, although I assume by your post that this is "cheap"), but one note: Boats in Florida are often valued a bit lower than those in other parts of the country. One reason may be that oftentimes they are quite a bit more "worn" than boats from up north. This is because near-tropical sun and "hot" salt are really hard on boats. The gelcoat and the metal parts both suffer. Also, if it's slipped, it's sitting in that same warm, "prolific" water.
Of course with a trailerable boat it may have been kept on the trailer and in a building - in which case it could be in great shape, and won't be a "typical" Florida boat. However it's still being sold in the Florida market, and so probably reflects that to a certain extent in price. (Or it could theoretically be sun-faded, oxidized, and have a lot of rusty metal and nasty bottom paint/blisters. It's hard to tell from small photos, although it looks like it may be in the former category).
Also, boats can be worth more near where they are made. So C-Dory's would be valued higher in the PNW, etc.
Then too, some sellers may not realize that the C-Dory holds its value, and so may price it lower than what they could possibly get for it.
On this last one I'm speaking pretty far out of my area of expertise, but this is a fishing-specific model (by name anyway), and I would imagine that there is a preference/prejudice for larger "sportfish" or other fishing boats with large engines in Florida (whether or not they are better or necessary). So that may impact the local value.
None of the above means this boat is "legit," but it's just reasons why it might be.
